Two boats left simultaneously from two marinas towards each other. The speed of the first boat is 16 km / h, the speed of the second is 13 km / h. The boats met and continued on. 5 hours after the start of movement, the distance between them became equal to 40 km. Find the distance between the marinas.
1) 16 ◦ 5 = 80 (km) – the first boat drove in total
2) 13 ◦ 5 = 65 (km) – the second boat drove in total
3) 80 – 40 = 40 (km) – left to drive the second boat to the pier
4) 65 + 40 = 105 (km) – the distance between the marinas
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